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习题练习:Physics Unit10: Fluids Related Topics



 作者: admin   总分: 80分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月29日 13:02  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The three common phases of matter n (syecn:bmoq54q1f: are

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Density is

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Substance A has a densityz,7eb ik(6y vc of $3.0 \; g/cm^{3}$ and substance B has a density of $4.0 \; g/cm^{3}$. In order to obtain equal masses of these two substances, the ratio of the volume of A to the volume of B will be equal to

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is not a unit of pressue5fh(l xu (o0ore?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider three drinking glasses. All three have the same area base, and alag0r0rk e3 hv3/ d:i es;u1rdjl three are filled to the same depth with water. Glass A is cylindrical. Glass B is wider at the top than at the bottom, and so holds more water than A. Glass C is narrower at th;uav j0rgid s/0 3 1rkehe:3rde top than at the bottom, and so holds less water than A. Which glass has the greatest liquid pressure at the bottom?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the difference between the pressures inside ajdb8ty55vqb0+ x. ljsnd outside a tire called?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When atmospheric pressur52/e80 siwr s*cxzs z2r3jxrce changes, what happens to the absolute pressure at the bottom of a cszw/ssiz 0x r*8r3 cr2x2ej5pool?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are originally 1.0 m beneath the surface of a pool. If qh:wntg0 ur79 you dive to 2.0 m beneath the surface, what happens to the absolute pressurw:uhq0 nr 9tg7e on you?

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10#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Pascal's principle.1g a (hogi vgh4-,(gv j9t)qss
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11#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Archimedes' princip8qx o7n2e s2y )sui;my n-vqp3le.
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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  $50 \; cm^{3}$ of wood is floating on water, and $50 \; cm^{3}$ of iron is totally submerged. Which has the greater buoyant force on it?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a rock sinks deeper and deeper into water of constant densit)cjv23dfw 0j grw 1o grzc(;q.r2eu,ay, what happens to the gce ,w2j 2r z(3vg fuqw1rro cd.a;j)0buoyant force on it?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Salt water has greater density thmrk *6u-(2kp1 :uikwl aphr 7ean fresh water. A boat floats in both fresh water and in hkupw u(ike1ram27k r- p:6*lsalt water. Where is the buoyant force greater on the boat?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Salt water is more dense than fresh water. A ship l k)bad f/nd( iphy66c737 dktfloats in both fresh water and p6adi(ldkn k)/ t f6hydc7 73bsalt water. Compared to the fresh water, the volume of water displaced in the salt water is

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A steel ball sinks in water but floats in a pool of mercury. Where is hqsh x(v xrh(8g-i4f 2k og,:sthe buoyant force on the ball gr ,fos(g8i24 xh(g:- xhkshvrqeater?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg piece of aluminum sits at the bottom of a lake, right next 7l( 7nhx adtfyupt;r9wwd 9/e)c.sa3 to a 10-kg piece of lead. Which has the greater buoyant fod9yeuta;whtw3 al(pn9c7.xr ) /dfs 7rce on it?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A piece of iron rests on top of a piece of wood floating in a ba, cmdi d23xj5nh/sl2i btp1/c thtub. If the iron is removed from the wood, what happens to the water level int/d2iib31hj p/nc cm5x ,d2sl the tub?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A piece of wood is floating in a bathtub. A second piece oikhlt *))(wa u1wmrnq9/z- fm f wood sits on top of the first piece, anmnqw-m 9*/zh atlk1 iwr)f)(ud does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Water flows through a pipe. The diameter of the pipe at point B 0*xku wqb2qmq8i i,n ;is larger than at point A. Where is the speed of the xkqu n i*;,mbiqw8q2 0water greater?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal fluid flows at 12 m/s in a horizontal pipe. If the pipe widens tl.:8al7 dc dc -f -(s)zruastlo twice its original radius, what is the flow speed in the widea(z 8suf7r lcc-dts.l )-lad:r section?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal fluid flows2-ed deep7btycnajg7tfdq5is 17 c 0u4j*74 d at 12 m/s in a horizontal pipe. If the pipe narrows to half its original radius, what is thed1 t7yqs g2cen*j ai ued770efcjd7pdt4-4 5b flow speed in the narrower section?

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23#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Bernoulli's pr7.: j rcn+sx3sbs2sliinciple.
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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which one of the following is associated with the law of conwz:6msc zu8kkop 5d6 /servation of energy in flu6 uo czw:pk8skm65zd/ids?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the speed of a moving fluid increases, the pressur2sd 8k nsaut6-e in the fluid

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Water flows through a pipe. The diameter/j5; jnxej)kd of the pipe at point B is larger than at poin)jn5ek; jdj/xt A. Where is the water pressure greatest?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When you blow some air above :6bad3epo vmek 3 ,n5ja paper strip, the paper rises. This is because

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sky diver falls through the air at terminal velocity. 6i02 l ;t 2qducpxhvwh--xl6nThe force of air resistance onl;qnp2t 06dluihxhc-v w2x6 - him is

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two Styrofoam balls, of radiic7nw jlk1ekms;c(0p7 R and 2R, are released simultaneously from a tall to ews;jc07lc1nm k(pk7wer. Which will reach the ground first?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When a small spherical rock of radius r falls through wa sh+h+9 nkiw)lter, it experiences a drhknwlsh+)+9i ag force $F=arv$, where $v$ is its velocity and $a$ is a constant proportional to the viscosity of water. From this, one can deduce that if a rock of diameter 2.0 mm falls with terminal velocity, $v$, then a rock of diameter 4.0 mm will fall with terminal velocity .

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which has the greatest effect on the flow of fp5l9 tpa+huay)b wn*x( tg4s1.x9 vkxluid through a narrow pipe? That is, if you made a 10% change in each of the quantities below, w4l5x ap +hasbwt.9*v g() xtk9yn1xu phich would cause the greatest change in the flow rate?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two horizontal pipes are the same length, but pipe B has twice the dss j* v;9ui9(ag sx6pka+cp+uiameter of pipe A. Water undergoes viscous flow in both pipes, subject to the same pressure difference across the lengths of the pipes. If the 6a*+c9xk(iu;9 gpssu psjva+flow rate in pipe A is Q, what is the flow rate in pipe B?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two horizontal pipes have the sao:fsv 9wv6.n 98nqrfvme diameter, but pipe B is twice as long as pipe A. Water undergoes viscous flow in bothfq6n9n8v9v:ofwrv s. pipes, subject to the same pressure difference across the lengths of the pipes. If the flow rate in pipe B is Q, what is the flow rate in pipe A?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When soup gets cold, it often x ajvp)hel21-y d fbc v-uh.77wa9 p/ntastes greasy. This "greasy" taste seems to be associated with oil spreading out all over the sur vlw pau -1j)/xn f.db-e9a2 hh7y7vcpface of the soup, instead of staying in little globules. To us "physikers", this is readily explained in terms of

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When a tube of diameter d is ; kfcoc.j)5ef placed in water, the water rises to a height h. If the diameter were half as great, how h;fc5 )k jco.efigh would the water rise?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Certain insects, such as the water bug, are suffi)wfx3 yf,y4z c4hin3wciently lightweight that they can run on top of water without breaking the surface tension. Water bug A has weight W. Water bug B is twice as big as bug A, in all dimensions. That is, bug B is twice as long, twice as wide, etc. What is the) ycxyf 3wzw fh,i344n weight of bug B?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Certain insects, such as the water oz 2w*uod3 2pkbug, are sufficiently lightweight that they can run on top of water without breaking the surface tension. This is possible because the water, due to surface tension, exerts an upward force on the bottom of the bug's feet. Suppose that the maximumu2*oz3pk d2ow possible upward force on the feet of water bug A is F. Now suppose that water bug B is twice as big as bug A in every dimension. That is, bug B is twice as long, twice as wide, etc. What is the maximum upward force on the feet of bug B?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A plastic block of dimensihzf dk o 4ktp(/8g0cz3ons 2.00 cm x 3.00 cm x 4.00 cm has a mass of 30.0 g. What4dg 0hckkzz 3/t(f8op is its density?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A liquid has a specific gravity of 0.357. What k ;uzzl5 h0;byis its density?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick weighs 50.0 N,i;gr6 gb;x q h+*f,jwfdy*1y b and measures 30.0 cm x 10.0 cm x 4.00 cm. What is the maximum pressure it can exert on 6ygf;*yh i+,r 1b d*gqwbxjf ;a horizontal surface?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person weighing 900 N is standing on snowshoes. Each snowshoe has a8 lllul 2mu o-t;ie+p0rea $2500 \; cm^{2}$. What is the pressure on the snow?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much pressure (absolute yzf 1lfplmy(2u5n9(e) must a submarine withstand at a depth of 120.0 m in the opfly y2 l(59uz(nm1fe cean?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular window of 30 cm diameter in a xa2b v*( .c vd0-v,bqj;g2ms:qv xajnsubmarine can withstand a maximum force v-q2nb20dx ;sjv(.bx:a jacq, vv*g mof $5.20 \times 10^{5} \; N$. What is the maximum depth in a lake to which the submarine can go without damaging the window?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the gauge pressure if the absolute pressure is 300 kP zsey3wy9h/ b ),jtz7ba?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the gauge pressure at a location 15.0 m below the surfacbt 0roa+o9ss9 e of sea? (The density of seaso0o9 ar t+b9swater is $1.03 \times 10^3 \; kg/m^{3}$.)

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the absolute pry/ bm9znx(dchy5 5i+nessure at a location 15.0 m below the surface of sea? (The densit5mnci (nzx/h+dy9b5 y y of seawater is $1.03 \times 10^3 \; kg/m^{3}$.)

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-N weight sits on the smajj egk/14-ov 6j7 /ms**v n(wqwm gwcrll piston of a hydraulic machine. The small pistojjwk*j1mcmvwsr6/gg/4vwn* o7 - e(qn has area $2.0 \; cm^{2}$. If the large piston has area $40 \; cm^{2}$, how much weight can the large piston support?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a hydraulic garagu+h ,4r3h sadse lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm. What force must r3sad sh4h,u+be applied on the small piston in order to lift a car weighing 20,000 N on the large piston?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 13,000 N vehicle is to be lifte,0vee j bo17lnd by a 25 cm diameter hydraulic piston. What force needs to be applied to a 5.0 cm diameter0lv 71jnobee, piston to accomplish this?

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50#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large p1g*gvf0 m,h5x;t6c)1e yg;pwjxzatf iston has a dix106fy p,5 xggztv1 )fah;t* e;gjwmcameter of 40 cm. The lift raises a load of 15,000 N.
(a) Determine the force that must be applied to the small piston    $N$ (fill in numerical value only)
(b) Determine the pressure applied to the fluid in the lift    $\times 10^5 \; Pa$ (fill in numerical value only)

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block of metal weighs 40 N in air and 30 N in water* qp/9 dzzsd-jrk 1vu fjyf/g43( krh3. What is the buoyant force oyfqkd/1 z jp *u vkhrszr/3-94(j3f dgf the water?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object has a volum7u2ok9ct, ;a1ev bz.5 r f1g5kiouwx3x1m n rme of $4.0 \; m^{3}$ and weighs 40,000 N. What will its weight be in water?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg cylinder of solid iron is supported by a string whileu zk ni48gi6i0q- rv20fewql2cw*,fk submerged in water. W8u0iz-q4 * wrg6c ii2vf ,20lwqknkfe hat is the tension in the string? (The specific gravity of iron is 7.86.)

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the density of gold i;l7ni b ei-qs4i)v za;s $19.3 \times 10^3 kg/m^{3}$, what buoyant force does a 0.60-kg gold crown experience when it is immersed in water?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A crane lifts a steel submarine (density a,e )+nswe63nkfw7x2. lfi7ogj3bww f.dn r:= $7.8 \times 10^3 \; kg/m^{3}$) of mass 20,000 kg. What is the tension in the lifting cable (1) when the submarine is submerged, and (2) when it is entirely out of the water?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object weighs 7.84 N when it is in air and 6.86 N when itc3*(d bkh5,h , g*8pgxlt xfdr is immersed in water. What is the specific g8x(lfxd,dg h5h c*3t,rp kg* bravity of the object?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is placed on a scale, and the sc8a anzhb:k*o 8ale reads 120 g. Now a 20-g piece ofo:k*8n8hbaz a copper (specific gravity = 8.9) is suspended from a thread and lowered into the water, not touching
the bottom of the container. What will the scale now read?

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58#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A piece of aluminum with a massw4:ib+,z r/x,yt9ok qhh9c ku of 1.0 kg and density of $2700 \; kg/m^{3}$ is suspended from a string and then completely immersed in a container of water. The density of water is $1000 \; kg/m^{3}$.
(a) Determine the volume of the piece of aluminum    $\times 10^{-4} \; m^3$ (fill in numerical value only)
(b) Determine the tension in the string after the metal is immersed in the container of water $N$ (fill in numerical value only)

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cylindrical rod of length 12 cm and f(az uri 6qet9 .ifm..tg47my diameter 2.0 cm will just barely float in water. What is it6zt (e .gtyif .i7muramf4 q9.s mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, akv*m ff ey9 trzdd *37jt2,qp1nd 0.50 m high. How many kilograms of mass can be d epqdyk* t *217ft jmvrf3,z9loaded onto the box before it sinks in a lake?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $1.0 m^{3}$ object floats in water with 20% of it above the waterline. What does the object weigh out of the water?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object floats with half its volume (a 1kwtv 1zia5uq,acbx4.c723tuyaq beneath the surface of the water. The weight of the displa ua.avak a13qx1twcqyi tz25b7 ,u(4cced water is 2000 N. What is the weight of the object?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solid object floats in water with three-fourths of its volume blh5(l.e3r+q cwfrbnwg r++z 6gl,m 3beneath the surface. What is the object's +.lqr5,n6zlb3 b(hlwg++m gc3r e frwdensity?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 200-N object floats with three-fourths of its volume beneath the surfa ;pk5;rqr)wt 8 lpm)sbce of the wq8)w;bmp l t 5rsrpk);ater. What is the buoyant force on the object?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear of mass 200 *,q u53 dmzafu3gefmh/7xt1skg stands on an ice floe 100 cm thick. What is the minimum area of the floe that will just support the bear in 3u7 sm,f3meafh qdxu1z/ g5t*saltwater of specific gravity 1.03? The specific gravity of ice is 0.98.

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Liquid flows through a pipe of diameter 3.0 ispya9y1pik3d,7 z z8 cm at 2.0 m/s. Find the flow rate.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Liquid flows through a 4.0 cm diameter pipe at 1.0 m/sh/kks w/n0dt8cskdct0 1:u3 o . There is a 2.0 cm diameter restriction in the li 0t/ s dku3:chtkco 8/n01kswdne. What is the velocity in this restriction?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Water flows at 12 m/s in a horizontal tth9j)p9 qasd.nnl8 3 pipe with a pressure of $3.0 \times 10^4 \; N/m^2$. If the pipe widens to twice its original radius, what is the pressure in the wider section?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much pressure does it take for a pump to supply a drinking fo8-hm/)2idu vxv35q w:v2tr qj*za9 o;x buwcyuntain with 300 kPa, if the founz83 w5mxb:jy vvv wro) c2tqq *9d;2/a ixuu-htain is 30.0 m above the pump?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A hole of radius 1.0 mvgtxi*(8 dnzdjh+ .p+m occurs in the bottom of a water storage tank that holds water at a depth of 15 m. At what rate will water flow out of the h + x zt(d.*+hd8pivnjgole?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Water flows through a horizontal pipe of cross-etyt28/ a7iagiqe48+en ep *isectional area $10.0 \; cm^{2}$ at a pressure of 0.250 atm. The flow rate is $1.00 \times 10^{-3} \; m^{3}/s$. At a valve, the effective cross-sectional area of the pipe is reduced to $5.00 \; cm^{2}$. What is the pressure at the valve?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  SAE No. 10 oil has a viscosity of 0.20 Pa-s. How long weaphy :2bz ./7c)woei ould it take to pour 4.0 L of oil through a funnel with a neck 15 cm long and 2.0 cm in diameter? Assume the surfach i2 7czy:ee wpo.b/a)e of the oil is kept 6 cm above the top of the neck, and neglect any drag effects due to the upper part of the funnel.

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that the build-up of fao1no n )f6n;ps +jzbw5tty tissue on the wall of an artery decreased the radius by 10%. By how much would the pressure provided by the heart have to be increased to maintain a consta6p;5zwn nsb1jfo+)onnt blood flow?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two narrow tubes are placed in a pan of water. Tube A has twick zlrua ff-p+5x.17sz *2uf*ta 2xhjoe the diameter of tube B. If water rises 24 cm in tube A, how higzou2tak 7zalrf +*5x x2hj*-fspf1. uh will it rise in tube B?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The surface tension of water is 0.073 N/m. How high will water rise in a capillg4fgl.6 -qvq yw6 jio5ary tube of diag-gqlfy6ji 4q 5.ov w6meter 1.2 mm?

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76#
 
  232

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To what height would 0ir(y53xm fd twater at 0 degree Celsius rise in a glass capillary tube with rdx(iyf5 m30 ta diameter of
0.50 mm?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A narrow tube is placed vertically in a pan of water, and the water rises in:feg f 5.of/zluka3p1 the tube to 4.0 cm above the level of the pan. The surface tension in the liquid is lowered to one-half its original value by the addition of some soap. What happens to the height of the liquid columnfu31fp:o/l fz eak5.g in the tube?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a rectangular frame of length 0.120 m and width 0.600 m wi s9fhosi54x rla6zf)rtg a( 16th a soap film formed withi5f z ihr69f4)xossag(6l ta1r n its confined area. If the surface tension of soapy water is 0.0260 N/m, how much force does the soap film exert on the 0.600 m side?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An adjustable rectangular framu;(alz; a9 w a. corxub63dqv-e has length 12 cm and width 5 cm, and is built in such a way that one of the longer sides can be moved without bursting the soap film contained in the frame. Soapy water has surface tension 0.026 N/m. How ud; b;3o9-azwruql ca6v( a .xmuch work is required to move the adjustable long side so that the frame is 12 cm square?

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